A slotted lock nut

Abstract

The utility model discloses a kind of slotted locking nuts, including nut body, fixed part, base, threaded hole, opening and rotating seat, the top end of the nut body is integrally formed with fixed part, the bottom end of the nut body is integrally formed with base, the nut body is coaxially arranged with fixed part and base, and the center of the nut body with fixed part and base is equipped with the threaded hole of intercommunication;Several openings suitable for pin shaft are formed on the fixed part;Rotating seat is rotatably arranged at the bottom end of the base, the number of the opening is four, four The openings are annularly arrayed, annular block is mounted on the lower end surface of the base, the middle part of the annular block is hollowly arranged and communicated with the threaded hole on the base, annular boss is arranged at the bottom of the annular block, the utility model can eliminate the large-area rotary friction between the base and adjacent components, make the nut body more easily rotate in place, reduce the required installation torque, improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of fasteners, and in particular to the technical field of a slotted locking nut. Background Technology

[0002] In the field of axle spindle assembly, slotted lock nuts are core components that ensure the axial fixation of critical parts, and therefore are widely used in the field of axle spindle assembly.

[0003] The slotted nuts currently available do not provide adequate anti-slip protection for the cotter pins during tightening, making it easy for the cotter pins to slip. In addition, the existing slotted nuts are relatively short in overall length, resulting in poor fixing performance.

[0004] To address the problems mentioned above, for example, application number CN201721912830.7 discloses a slotted nut, including a hexagonal nut with an internal thread. One end of the hexagonal nut is fixedly connected to a sleeve, and the end of the hexagonal nut away from the sleeve is fixedly connected to a fixing tube. The side end of the fixing tube has six slots distributed in an annular pattern. By setting anti-slip grooves, a cotter pin is inserted from the slots into the bolt hole with holes to prevent the nut from automatically loosening, thus fixing the nut. The anti-slip grooves on the inner side of the slots ensure good rotation after the cotter pin is inserted, preventing slippage and thus avoiding easy slippage of the cotter pin when fastening parts.

[0005] However, the above structure cannot correctly determine the slotted position of the slotted nut during the tightening process. If the slotted position is not aligned with the pin hole of the screw, the cotter pin cannot be guaranteed to be inserted and tightened, requiring repeated tightening, which is time-consuming, labor-intensive, and inefficient.

[0006] To address the problems mentioned above, for example, application number CN201920725504.8 discloses a hexagonal flange face slotted nut whose slot position can be determined when tightened. The nut includes a hexagonal flange face nut body, comprising a flange portion and a hexagonal cylindrical portion placed on the side end face of the flange portion. The hexagonal cylindrical portion and the flange portion are coaxially arranged, and both the cylindrical portion and the flange portion have interconnected threaded holes at their centers. Multiple pointing structures corresponding to the slots are provided at the contact points between the cylindrical portion and the flange portion. When a worker tightens the slotted nut with a hexagonal wrench, the slot position can be determined based on these pointing structures. When tightening the slotted nut and the wheel axle screw, the slot and the pin hole on the wheel axle screw are aligned in one go, increasing worker convenience, reducing work steps, and improving work efficiency.

[0007] However, the above structure still has the following drawbacks: The bottom of the nut needs to fit tightly against the end face of adjacent components such as the bearing housing. During the tightening process, rotational friction occurs between the bottom of the nut and the stationary component, which can easily cause scratches or wear on the contact surface, affecting the sealing performance and assembly accuracy. At the same time, the frictional resistance increases the installation torque, resulting in low operating efficiency in confined spaces or scenarios requiring high preload. Summary of the Invention

[0008] The purpose of this invention is to solve the problems in the prior art by proposing a slotted locking nut that can eliminate large-area rotational friction between the base and adjacent components, making it easier for the nut body to rotate into place, reducing the required installation torque, and improving assembly efficiency.

[0009] To achieve the above objectives, this utility model proposes a slotted locking nut, comprising a nut body, a fixing part, a base, a threaded hole, a slot, and a rotating seat. The top end of the nut body is integrally formed with the fixing part, and the bottom end of the nut body is integrally formed with the base. The nut body, the fixing part, and the base are coaxially arranged, and the center of the nut body, the fixing part, and the base are all provided with a threaded hole that communicates with each other. The fixing part is provided with a plurality of slots adapted to the pin shaft. The bottom end of the base is provided with a rotating seat.

[0010] Preferably, there are four slots, and the four slots are arranged in a circular array.

[0011] Preferably, an annular block is installed on the lower end face of the base, the middle part of the annular block is hollow and communicates with the threaded hole on the base, and an annular boss is provided at the bottom of the annular block.

[0012] Preferably, the rotating seat has a hole at its center that communicates with the threaded hole, and the inner wall of the hole has an annular groove that matches the annular boss. The base is rotatably connected to the rotating seat by the annular boss on the annular block being embedded in the annular groove.

[0013] Preferably, the annular boss has an annular mounting groove on its side wall, and a plurality of balls are pre-set in the annular mounting groove. The balls protrude from the surface of the annular mounting groove and are embedded in the annular groove to form a rolling fit.

[0014] Preferably, a gap is left between the base and the rotating seat.

[0015] The beneficial effects of this utility model are: This invention, by adding a rotating seat, eliminates large-area rotational friction between the base and adjacent components, making it easier to rotate the nut into position, reducing the required installation torque, and improving assembly efficiency. This avoids damage to the lower surface of the base and the contact surfaces of adjacent components caused by rotational friction, maintaining the flatness and smoothness of the contact surfaces, which is beneficial for sealing and long-term reliability. Furthermore, it reduces uneven locking force or off-center loading caused by friction interference, allowing the axial clamping force to act more effectively and evenly on the target position. This allows installers to focus solely on rotating the nut, eliminating the need for additional fixing or handling of potential rotational issues under the base. Moreover, even if the mounting surfaces of adjacent components are slightly uneven, the rotating seat can adaptively adjust the contact to a certain extent, ensuring effective clamping. Attached Figure Description

[0016] Figure 1 This is a front view of a slotted locking nut according to this utility model; Figure 2 This is a schematic diagram of a rotating seat for a slotted locking nut according to the present invention; Figure 3 This is a schematic diagram showing the disassembled base and rotating seat of a slotted locking nut according to this utility model; Figure 4 This is a schematic diagram of another embodiment of the slotted locking nut of this utility model; Figure 5 This is an assembly diagram of a slotted locking nut according to the present invention; In the figure: 1-nut body, 2-fixed part, 3-base, 4-threaded hole, 5-groove, 6-rotating seat, 7-ring block, 701-ring boss, 7011-ring mounting groove, 7012-ball bearing, 8-hole, 801-ring rotating groove. Detailed Implementation

[0017] Example 1 See Figure 1This utility model discloses a slotted locking nut, comprising a nut body 1, a fixing part 2, a base 3, a threaded hole 4, a slot 5, and a rotating seat 6. The fixing part 2 is integrally formed at the top of the nut body 1, and the base 3 is integrally formed at the bottom. The nut body 1, the fixing part 2, and the base 3 are coaxially arranged, and the nut body 1, the fixing part 2, and the base 3 all have interconnected threaded holes 4 at their centers. The fixing part 2 has several slots 5 adapted to the pin shaft. The rotating seat 6 is rotatably mounted at the bottom of the base 3. A main shaft (not shown in the figure) is... The nut body 1 has a pre-set pin hole (not shown in the figure). The installer continuously tightens the nut body 1 until the predetermined locking position is reached. At this time, the fixing part 2 on the nut body 1 rotates exactly to the position of the pin hole at the end of the spindle. Then, the nut body 1 is adjusted so that the several slots 5 on the fixing part 2 are precisely aligned with the radial pin hole at the end of the spindle. Then, the pin is inserted into the pin hole on the spindle and passes through the corresponding slot 5 on the fixing part 2. The pin passes through the spindle and the fixing part 2, thereby effectively preventing the nut body 1 from rotating in the opposite direction relative to the spindle and achieving the locking effect.

[0018] See Figure 1 There are four slots 5, which are arranged in a circular array. By arranging the slots 5 in a circular array, the pin is inserted into the pin hole on the main shaft from one side of the fixing part 2 and then passes out from the other side of the fixing part 2, thereby achieving a locking effect.

[0019] See Figure 3 An annular block 7 is installed on the lower end face of the base 3. The middle part of the annular block 7 is hollow and communicates with the threaded hole 4 on the base 3. An annular boss 701 is provided at the bottom of the annular block 7. By adding the annular boss 701, it can be embedded in the annular groove 801 on the rotating seat 6 to form a rotating connection.

[0020] See Figure 3The rotating seat 6 has a hole 8 at its center that communicates with the threaded hole 4. The inner wall of the hole 8 has an annular groove 801 that matches the annular boss 701. The base 3 is rotatably connected to the rotating seat 6 by the annular boss 701 on the annular block 7 embedding into the annular groove 801. When an installer applies a tool to the outer surface of the nut body 1, the nut body 1, the upper fixing part 2, the lower base 3, and the annular block 7 on the base 3 rotate together around the main shaft. During this rotation, because the annular boss 701 at the bottom of the annular block 7 is embedded in the annular groove 801 within the hole 8 of the rotating seat 6, a rotating pair is formed. When the nut body 1 rotates, the annular boss 701 slides smoothly relative to the annular groove 801. The rotating seat 6 itself, because its lower end face is pressed against the stationary surface of the adjacent component, is subjected to static friction and thus basically remains non-rotating. Due to the rotating pair design of the annular boss 701 and the annular groove 801, even if there is a slight vibration or displacement tendency of the adjacent component or the spindle during operation, the rotating seat 6 can maintain its clamping function under the action of these axial forces and will not transmit the rotation tendency to the adjacent component. There is only axial clamping force between the rotating seat 6 and the adjacent component, without relative rotational movement, thereby greatly improving assembly efficiency.

[0021] Example 2 See Figure 4 The annular boss 701 has an annular mounting groove 7011 on its side wall. A plurality of balls 7012 are pre-set in the annular mounting groove 7011. The balls 7012 partially protrude from the surface of the annular mounting groove 7011 and are embedded in the annular rotating groove 801 to form a rolling fit. In this application, the side wall of the annular mounting groove 7011 is provided with a limiting edge (not shown in the figure) to prevent the balls 7012 from falling out of the annular mounting groove 7011, while not affecting the normal rolling of the balls 7012. By adding balls 7012 in the annular mounting groove 7011, the friction between the annular boss 701 and the annular rotating groove 801 is reduced, allowing the nut body 1 to rotate more freely, thus saving time and effort and making the operation more convenient.

[0022] See Figure 1 A gap is left between the base 3 and the rotating seat 6 to avoid affecting the normal rotation of the nut body 1.

[0023] The working process of this utility model: In operation, the slotted locking nut of this utility model is first fitted onto the axle spindle. The threaded hole 4 inside the nut body 1 engages with the external thread (not shown in the figure) on the spindle. At this time, the lower end face of the rotating seat 6 contacts the adjacent component that needs to be pressed at the end of the spindle. Then, the installer uses a tool to apply torque to the outer surface of the nut body 1, thereby driving the nut body 1, the upper fixing part 2, the lower base 3, and the annular block 7 on the base 3 to rotate around the spindle. During this rotation, since the annular boss 701 at the bottom of the annular block 7 is embedded in the annular groove 801 in the hole 8 of the rotating seat 6, a rotating pair is formed. Therefore, when the nut body 1 rotates, the annular boss 701 slides smoothly relative to each other in the annular groove 801, while the rotating seat 6 itself, because its lower end face is pressed against the stationary surface of the adjacent component, is subjected to static friction. While remaining stationary, the nut body 1 rotates downwards on the spindle thread, generating the axial clamping force required for locking. This axial force is transmitted through the nut body to the base 3, then through the base 3 to the annular block 7, and finally through the annular boss 701 at the bottom of the annular block 7 to the rotating seat 6. The rotating seat 6 then transmits the axial clamping force and presses it onto the adjacent components. The installer then continues to tighten the nut body 1 until the predetermined locking position is reached. At this point, the fixing part 2 on the nut body 1 rotates precisely to the position of the pin hole at the end of the spindle. The nut body 1 is then adjusted so that the slots 5 on the fixing part 2 are aligned with the radial pin holes at the end of the spindle. Finally, the pins are inserted sequentially into the pin holes on the spindle and through the corresponding slots 5 on the fixing part 2. Once the pins have passed through the spindle and the fixing part 2, any reverse rotation of the nut body 1 relative to the spindle is effectively prevented, achieving effective anti-loosening locking.

[0024] After the nut body 1 is locked by the pin, the entire nut body 1 is completely fixed relative to the main shaft and cannot rotate. The rotating seat 6 is still rotatably connected to the annular boss 701 on the annular block 7 through its annular groove 801. At this time, the rotating seat 6 continues to transmit the axial locking force generated by the nut to the adjacent parts. Due to the rotating pair design of the annular boss 701 and the annular groove 801, even if there is a slight vibration or displacement tendency of the adjacent parts during the operation, the rotating seat 6 can maintain its clamping function under the action of these axial forces, and will not directly transmit the rotation tendency to the adjacent parts. There is only axial clamping force between the rotating seat 6 and the adjacent parts, without relative rotational movement. This application effectively solves the problem of rotational interference between the bottom of the base of the nut at the end of the axle main shaft and the contact surface of the adjacent parts during and after the locking process, significantly improving the ease of installation, protecting the contact surface, and ensuring the effective transmission of the locking force.

[0025] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A slotted locking nut, characterized in that: The nut body (1) includes a fixing part (2), a base (3), a threaded hole (4), a slot (5), and a rotating seat (6). The fixing part (2) is integrally formed at the top of the nut body (1), and the base (3) is integrally formed at the bottom. The nut body (1), the fixing part (2), and the base (3) are coaxially arranged, and the nut body (1), the fixing part (2), and the base (3) are all provided with a threaded hole (4) that communicates with each other. The fixing part (2) is provided with a number of slots (5) that are adapted to the pin shaft. The rotating seat (6) is provided at the bottom of the base (3).

2. The slotted locking nut as described in claim 1, characterized in that: There are four slots (5), and the four slots (5) are arranged in a ring array.

3. A slotted locking nut as described in claim 1, characterized in that: An annular block (7) is installed on the lower end face of the base (3). The middle part of the annular block (7) is hollow and communicates with the threaded hole (4) on the base (3). An annular boss (701) is provided at the bottom of the annular block (7).

4. A slotted locking nut as described in claim 3, characterized in that: The center of the rotating seat (6) is provided with a hole (8) communicating with the threaded hole (4). The inner wall of the hole (8) is provided with an annular groove (801) that is adapted to the annular boss (701). The base (3) is inserted into the annular groove (801) on the annular block (7) to form a rotating connection with the rotating seat (6).

5. A slotted locking nut as described in claim 4, characterized in that: The annular boss (701) has an annular mounting groove (7011) on its side wall. A plurality of balls (7012) are pre-set in the annular mounting groove (7011). The balls (7012) protrude from the surface of the annular mounting groove (7011) and are embedded in the annular rotating groove (801) to form a rolling fit.

6. A slotted locking nut as described in claim 1, characterized in that: A gap is left between the base (3) and the rotating seat (6).

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